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NigeriaEnglish DOWESTON digital pH/ORP sensors combine advanced solid-state electrode technology with intelligent temperature compensation to deliver long-term, stable and reliable water-quality data in demanding industrial environments such as wastewater treatment, pharmaceutical purified water and food & beverage processing.
Digital in-line pH/ORP sensor — Industry 4.0 ready, dual Modbus RTU and 4-20mA outputs, replaceable probe that lowers total cost of ownership.
From digital in-line sensors to multi-channel recorders, DOWESTON offers a complete analytical measurement chain for water quality
RS-485/Modbus RTU output, automatic temperature compensation, replaceable probe
Accurate oxidation-reduction potential measurement for disinfection and wastewater process control
1-6 universal inputs, fully isolated design, alarm relay outputs as standard
Online monitoring solutions for turbidity, dissolved oxygen, conductivity, ammonia and more
Click a product card for details; the comparison table below makes selection easy
Six technical highlights for long-term measurement reliability in harsh conditions
Premium imported glass sensing membrane and ceramic junction extend electrode life by 3x or more versus conventional electrodes, greatly reducing maintenance frequency and replacement cost.
A built-in high-precision NTC sensor automatically compensates for temperature effects on pH across a wide -5°C to 80°C range for accurate, dependable readings.
Dual RS-485 Modbus RTU and 4-20mA outputs integrate seamlessly with PLC/DCS/SCADA systems. Probes are plug-and-play with automatic identification — no tedious configuration.
The overall IP68 waterproof and dustproof design supports continuous submersed installation in wet wells, aeration basins, grit chambers and other permanently wet environments.
Probe and transmitter are separate: the electrode head can be swapped in the field without returning the unit, minimizing downtime and maintenance cost.
Every sensor is factory-calibrated with multi-point standard buffers and ships with a calibration certificate. Simply install, run a quick verification and it is ready for operation.
A wide range of online pH/ORP monitoring needs, from municipal wastewater to high-end pharmaceuticals
Online pH monitoring in aeration and nitrification/denitrification basins controls the biological process and ensures compliant effluent. IP68 design allows continuous submerged installation.
Online pH/ORP monitoring of WFI and PW loops meets GMP and FDA compliance requirements to safeguard pharmaceutical water quality.
Real-time pH monitoring in beer fermentation, dairy production and beverage blending. Hygienic designs are available with CIP/SIP capability.
Online pH monitoring of boiler feedwater, boiler water and condensate prevents pipe corrosion and scaling, protecting power generation equipment. High-temperature/high-pressure models available.
Online pH monitoring in neutralization reactors, chemical storage tanks and pipelines. Strong acid/alkali resistant materials available (PTFE/PVDF/PEEK).
Online pH and ORP monitoring for fish ponds, shrimp tanks and RAS facilities, linked to aerators and water exchange to maintain optimal growing conditions.
Side-by-side comparison of key specifications for quick selection
| Parameter | PH-D120 | ORP-D120 | DPH-160 | ORP-D160 |
|---|---|---|---|---|
| Measuring Range | 0~14 pH | ±2000 mV | 0~14 pH | ±2000 mV |
| Resolution | 0.01 pH | 1 mV | 0.01 pH | 1 mV |
| Temperature Compensation | Automatic, -5~80°C — standard on all models | |||
| Output Signal | RS-485/Modbus | RS-485/Modbus | RS-485/Modbus + 4-20mA | RS-485/Modbus + 4-20mA |
| Ingress Protection | IP68 — standard on all models | |||
| Replaceable Probe | ✔ Yes | ✔ Yes | ✔ Yes | ✔ Yes |
| Typical Applications | General industrial water | Disinfection / ORP control | Demanding industrial water | Precision ORP control |
DOWESTON application engineers provide one-on-one selection advice and on-site technical support based on your specific conditions (medium, temperature, pressure, installation).
Talk to a Technical Advisor
DOWESTON · 13 years of measurement excellence · global process instrumentation brand
DowestonPrecision measurement & control instrument manufacturer
Service Hotline+1 (314) 325-4420
E-mailinfo@doweston.com
Address617 Cepi Drive, Chesterfield, MO 63005, USA
Tell us about your measurement task and we will help with product selection and technical questions.info@doweston.com
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